Finding the Fourth Proportional to 66,105.63, 91,180.67 and 42,221.61

Step by Step Solution

1. Step 1: Write the proportion equation
   66,105.63 : 91,180.67 = 42,221.61 : x
2. Step 2: Convert to fraction form
   66,105.63/91,180.67 = 42,221.61/x
3. Step 3: Cross multiply
   66,105.63x = 91,180.67 × 42,221.61
4. Step 4: Simplify right side
   66,105.63x = 3,849,794,477.17
5. Step 5: Solve for x
   x = 3,849,794,477.17/66,105.63
6. Step 6: Final answer
   x = 58,237.01